Run: 2026-04-24-01KQ0NEZQ64VHM8S3BSMWBXB9B

Run Details

Duration:
15.1s
Cost:
$0.029335
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
100.00% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain worried the windows of Blackthorn Manor while Inspector Vale studied the grandfather clock stopped at midnight precisely again tonight. Beneath its brass pendulum lay Lord Harrow, one gloved hand clutching a white rook from the chessboard beside him silently. The guests gathered in the library doorway, their faces pale masks reflected by lightning in the polished floor nearby tonight. No one spoke until Miss Elspeth, the dead man's niece, noticed blood darkening the cuff of the butler, Mr. Crane. Crane lifted his hands slowly, revealing clean palms, yet his silver serving knife had vanished from dinner without explanation entirely. Inspector Vale asked everyone to remain inside, because the storm had swallowed the bridge and telephone lines before dawn completely. From the hearth came a sudden crackle, and a sealed envelope curled black at the edges among the orange embers. On its face, in Harrow's unmistakable script, four words survived the flames: Trust none of them, not even me tonight.
created_at"2026-04-24T21:13:50.063Z" 4/24/2026, 9:13:50 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency13421
moderation_latency(null)
generation_time14872
tokens_prompt46
tokens_completion375
native_tokens_prompt41
native_tokens_completion971
native_tokens_completion_images0
native_tokens_reasoning758
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.029335
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_0b31c43cc4967cc60169ebdd0ee9288197b4573a80281c9343"
is_byokfalse
latency1040
model_permaslug"openai/gpt-5.5-20260423"
provider_name"OpenAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer(null)
request_id"req-1777065230-rOtW6OPaslhMyIODXZeM"
session_id(null)
api_type"completions"
id"gen-1777065230-D3aBSkqYBSBY2s8S3nxS"
upstream_id"resp_0b31c43cc4967cc60169ebdd0ee9288197b4573a80281c9343"
total_cost0.029335
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
020
120
220
320
420
520
620
720